I tried a new flavor today and it is pretty bad. I can tolerate it just enough not to throw it out. My plan is to keep it around and use as a backup in case I ever run out or juice there will be some around.
I don't see an expiry date or anything. The flavor is called Lexport Hey (tastes like Export A my ...)
Do a search on here for steeping e-liquid. The simple thing is to stick it in a dark closet out of the way for month and then revisit one day when you are bored, if it still taste bad to you, it may just not be a flavor for you.
If you have recently started vaping and dropped analogs, be prepared for your sense of smell and taste to do some strange things. There were flavors that I tried in the first week or so vaping that seemed good at the time, but now that my sense of smell and taste have gotten so much better I can't stand them. My big example is a tobacco flavor I bought that was great for a week or so, that now taste like a bouquets of flowers that burns my nose.
Also remember that there are a ton of variables involved in how you receive your vapor. For instance, if you try a flavor in a store that you really like, but get a bottle home and don't like, it could be related to a difference in vaping equipment. For example if you try a sample of the the liquid in a stardust type clearomizer, then go home and fill up a pro tank on a VV or VW device the flavor profile can change dramatically.
Hope this helps, stick with it, you will find flavors that work well for you. I guarantee you will probably find a myriad of flavors that work for you and you WILL spend good money on flavors that taste like monkey-.... to you.
I'm still pretty new to vaping myself but this has been my experience so far. Hope this helps a little.
-Will